CVE-2026-78064
J2Store Joomla extension allows anonymous cart tampering via unauthenticated 'save' (format=raw).
Is CVE-2026-78064 being exploited?
Not confirmed. CVE-2026-78064 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.24% probability of exploitation in the next 30 days.
How severe is CVE-2026-78064?
CVE-2026-78064 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-78064?
Not known from our data. No patch reference has been recorded for CVE-2026-78064, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-78064 affect?
CVE-2026-78064 affects J2Store 1.0.0-3.3.21, J2Store 4.0.0-4.0.21, J2Store 4.1.0-4.1.6, Joomla sites using J2Store extension. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-78064?
Apply vendor patch when available or disable J2Store; block front-end format=raw requests.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can insert or overwrite cart rows with attacker-chosen user_id/session_id, enabling order manipulation and session/account tampering.
Immediate action required
- affected1.0.0-3.3.21
- affected4.0.0-4.0.21
- affected4.1.0-4.1.6
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.